SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53cc14910aaf05f3ed25f91074deefbf9a678afd16248bf8fa69932355329380' 
  AND token = 'swoWWhszfpE+caBX7R++e3Ud5G2Gq8OgsIxXmKp084Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}